Alrighty, what type of plugs should I use in my mach z? Right now I've got ngk 8's on the clutch side and center, and the last cylinder is a 9. This is how I bought it, so I'm wondering if I should just keep it this way or what? Ngk.com recommends I run 10's in all my cylinders but I've heard most people use 8's or 9's. Any help would be appreciated! Thanks

Someone who was too lazy to correct jetting or another problem (too rich) did that.
There is no reason to be using the wrong heat range plug and certainly none for using two different ranges in an engine.

Put the 10's in and run it at the correct operating temp and check plug color and piston wash.

Yeah I just put the spare br9es' I had from my sl in the mach today, and it seems to run better. So should I just stick with the es' or should go with the eix? Is it just a better quality plug? I've used br9es' in all my sleds and they've worked great for me!

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